Marquise Shape 16 x 8 mm calibrated natural loose gems from GemSelect

Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated marquise shaped facet cut gems, gemstone carvings and cabochons available in 16 mm x 8 mm sizes. For the largest selection of colored gemstones, Shop GemSelect Online.

As a general guideline, when it comes to calibrated gems, they are not usually expected to be cut to exact measurements and specifications. But rather, they're cut with slight variance in size, though the close approximatation in size is not clearly defined, there are general guidelines for what is considered acceptable. Obviously larger and heavy carat weight stones allow more room in size for variance, while smaller stones may leave little to none. This means a large 30mm calibrated gemstone, could actually be closer to 31 millimeters. For this reason, we recommend to always view the exact size in addition to the calibrated size details. The exact size will inform you of the variance you can expect. Some setting styles are more flexible with variance, such as prong settings, while other styles of mountings may need almost an exact size to the fraction of millimeter.

For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

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making my own jewelry for my birth stone

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blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

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Very large selection of items and we used the stones to have several pieces of jewelry made for us.

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Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

2.27 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9.1 x 7.4 mm

2.44 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.8 x 4.8 mm

3.51 ct Green Sphene, 9 x 8.1 mm Oval Cut From Sri Lanka

11 ct White Quartz, 14.1 x 14 mm Asscher Cut From Brazil

3.3 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gems, 10.1 x 7.7 mm

7.45 carat White Topaz, Square loose Topaz from Brazil, Natural Untreated Gems, 5.1 x 5.1 mm

0.17 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.4 mm

3.16 ct Green Agate, 10.2 x 8.2 mm Oval Cut From India

4.38 ct Oval Spectrolite, 10.2 x 8.1 mm From Finland

7.16 ct Green Jadeite, 22.1 x 10.3 mm Marquise Cut From Myanmar

6.77 carat Pink Mystic Topaz, Pear Shape loose Mystic Topaz from Brazil, Natural Gem, 14.1 x 10.1 mm

0.95 ct Oval Peridot, 6.1 x 4.2 mm From China

1.74 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 5.2 x 4.1 mm

79.05 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gems, 24.7 x 17.3 mm

15.8 ct Oval Jasper, 24.2 x 16.8 mm From Indonesia

19.25 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 19.6 x 18.6 mm

3.62 ct Black Star Sapphire, 9.6 x 7.8 mm Oval Cut From Thailand

3.86 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 8.1 x 8 mm

3.84 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gems, 6.8 mm

0.77 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 6.2 x 4.4 mm

22.37 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.1 x 18 mm

5.94 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 17.7 x 9.5 mm

4.13 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4 mm

1.27 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5.1 mm

1.69 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.9 x 6.1 mm

5.64 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10 x 8 mm

0.52 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 4.9 mm

1.35 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.4 x 3.2 mm

32.54 ct Oval Jasper, 31.8 x 21.2 mm From Indonesia

0.6 ct Loose Violet Sapphire, 5.9 x 4 mm Oval Cut From Tanzania

3.03 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

13.24 ct Loose Oval Bloodstone, 19.9 x 14.7 mm From Madagascar

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